A Theoretical Study of the Reaction of Fe+ with CH3X (X=Cl, Br, I)

doi:10.6023/A13020177

Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (05): 749-754.DOI: 10.6023/A13020177 Previous Articles Next Articles

Article

Fe⁺与CH₃X (X=Cl, Br, I)反应的理论研究

孙小丽, 李吉来, 黄旭日, 孙家锺

吉林大学理论化学研究所理论化学国家重点实验室长春 130023

投稿日期:2013-02-05 发布日期:2013-03-26
通讯作者: 李吉来,Jilai@jlu.edu.cn;黄旭日,huangxr@jlu.edu.cn E-mail:huangxr@jlu.edu.cn
基金资助:
项目受国家重点基础研究发展计划(973)(No. 2012CB932800)、国家自然科学基金(Nos. 21103064, 21073075和21173097)、教育部博士点基金(No. 20100061110046)、吉林大学理论化学国家重点实验室专项基金和吉林大学基本科研业务费(Nos. 421010061439, 450060445067)资助.

A Theoretical Study of the Reaction of Fe⁺ with CH₃X (X=Cl, Br, I)

Sun Xiaoli, Li Jilai, Huang Xuri, Sun Chiachung

State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China

Received:2013-02-05 Published:2013-03-26
Supported by:
Project supported by the National Basic Research Program of China (973 Program) (No. 2012CB932800), the National Natural Science Foundation of China (Nos. 21103064, 21073075, 21173097), the Research Fund for the Doctoral Program of Higher Education of China (No. 20100061110046), the Special Funding of State Key Laboratory of Theoretical and Computational Chemistry, Jilin University and Basic Research Fund of Jilin University (Nos. 421010061439, 450060445067).

1. A Theoretical Study of the Reaction of Fe⁺ with CH₃X (X=Cl, Br, I).PDF(118KB)

Abstract

The C—X bond functionalization catalyzed by iron and their complexes has attracted much attention. Using density functional theory (DFT), we herein studied the reactivity and mechanism of iron cation (Fe⁺) towards C—X bond cleavage of CH₃X (X=Cl, Br, I) at B3LYP/def2-SVP level of theory. The results show that there are two possible pathways available for the title reactions, i.e. the insertion mechanism and the S_N2 mechanism, respectively. Mechanistically, in the insertion mechanism, the reactions stem from Fe⁺ attacking on the side of CH₃X and results in the generation the products FeX⁺ and CH₃^·; whereas in the S_N2 mechanism, the Fe⁺ initially attacks the substrate from the back of C—X yielding FeCH₃⁺ and X^·. The results show that the sextet and the quartet states of Fe⁺ demonstrate quite distinct reactivity towards the cleavage of C—X bonds in the most potential pathways, and the quartet pathways are dominant in all the pathways. The relative higher barriers in the S_N2 pathways results in their lower competitiveness in the title reactions. In addition, our results show that, for all the three reaction systems, the insertion mechanism is exothermic; whereas for the S_N2 mechanism, only X=I is exothermic, however. Furthermore, the calculations also show that these reactions demonstrate two-state reactivity (TSR) scenario. There are minimum energy crossing points (MECPs) between the sextet and quartet state on potential energy surfaces (PESs) both at the entrance and export sides for the two reaction mechanisms. On the other hand, the electron transfer evolution analysis indicates that the spin polarization plays important role in the stabilization of the potential energy surfaces and as a result, it controls the pathways by which it takes place and the branch ratio of the major products and byproducts. This thorough theoretical study, especially the detailed electronic structure analysis, may provide important clues for understanding the C—X bond activation and theoretical fundamental evidences for iron-based catalysts design.

Key words: Fe⁺, insertion, S_N2, reaction mechanism, activation barrier, electronic structure

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Sun Xiaoli, Li Jilai, Huang Xuri, Sun Chiachung. A Theoretical Study of the Reaction of Fe⁺ with CH₃X (X=Cl, Br, I)[J]. Acta Chimica Sinica, 2013, 71(05): 749-754.

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Fe⁺与CH₃X (X=Cl, Br, I)反应的理论研究

A Theoretical Study of the Reaction of Fe⁺ with CH₃X (X=Cl, Br, I)

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Fe+与CH3X (X=Cl, Br, I)反应的理论研究